Robust superhydrophobic tungsten oxide coatings with photochromism and UV durability properties

Ji, Ting; Guo, Zhiguang

doi:10.1016/j.apsusc.2016.06.125

Cited by 38 publications

(16 citation statements)

References 38 publications

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“…YH x :O y responds to UVA or blue light and presents high transparency in the clear state, therefore it has multitude of potential applications including smart windows, ophthalmic lenses, security markings, and many more . The photochromic family mostly consists of organic materials, but also embraces some inorganic compounds such as silver halides, tungsten oxide, or molybdenum trioxide . Apart from YH x :O y , other oxygen‐containing rare earth hydrides, or oxy ‐ hydrides , such as the ones based on Gd, Dy, and Er have been recently proved to be also photochromic .…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Ellipsometry and Microstructure Characterization of Photochromic Oxygen‐Containing Yttrium Hydride Thin Films

Montero

Karazhanov

2018

Physica Status Solidi (a)

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Oxygen‐containing yttrium hydride, YHx:Oy, is an inorganic phothochromic material which exhibits promising features for its application in smart windows, ophthalmic lenses, and many more. In the present work the optical properties of photochromic and non‐photochromic YHx:Oy thin films prepared by magnetron sputtering are studied by variable angle ellipsometry and spectrophotometry. These include the study of the complex refractive index, the transmittance, and luminous transmittance, as well as the reflectance of a selection of samples of diverse structural properties obtained under different deposition conditions. In the case of the photochromic YHx:Oy thin films, the refractive index in the near infrared and visible regions is found similar to the one corresponding to yttrium oxide, Y2O3. However, the YHx:Oy films exhibit a smaller band gap and hence higher absorption in the near ultraviolet than Y2O3. The photodarkening potential of the films are also quantified and characterized by the study and modeling of their optical properties before and after illumination. Our results show that photochromic YHx:Oy films, with a luminous transmittance above 80 % in the clear state, can reduce its transparency up to a 30% after 1 h illumination at 1 Sun.

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Section: Introductionmentioning

confidence: 99%

Spectroscopic Ellipsometry and Microstructure Characterization of Photochromic Oxygen‐Containing Yttrium Hydride Thin Films

Montero

Karazhanov

2018

Physica Status Solidi (a)

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“…The hardness of the pencil lead was increased in steps until visible defects marked the surface. Water droplets were dropped on the slant (6 • ) sample with graphite powder placed evenly to observe the self-cleaning effect of the surfaces [21].…”

Section: Characterizationmentioning

confidence: 99%

“…However, a big challenge in their application is poor mechanical stability, where most would lose function when exposed to oil as the low surface tension of the oil makes it easy to penetrate through the surfaces [20]. Additionally, the weak or uncrosslinked chemical bonds of low surface energy substances like alkane, silicone, and fluoride usually lead to poor UV durability as well as low resistance to corrosive liquids and organic solvents [21]. In contrast, epoxy resins as well as its composites have been widely employed in severe environments such as marine-varnishes, and chemical and nuclear plant surfaces due to their excellent adhesion, mechanical properties, and good solvent and chemical resistance [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Surface with Gamma Irradiation Resistance and Self-Cleaning Effect in Air and Oil

Zhang

Liu

2020

Coatings

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A superhydrophobic surface was synthesized by a combination of an epoxy/polymethylphenylsiloxane matrix and dual-scale morphology of silica (SiO2) nanoparticles. When the amount of SiO2 reached 30 wt.%, the as-prepared surface showed a high static water contact angle (WCA) of 154° and a low sliding angle (SA) of 5°, excellent water repellency, and dirt-removal effects both in air and oil (hexamethylene). Even after exposure to as high as a 12.30 Mrad dose of gamma-rays, the composite surface still maintained its superior performance.

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“…The pH values were selected by considering the pH of washing solution (9-11) [37], tap water/deionized water (6-7), and acid rain (4) [38]. WCA was measured after an immersion period of 100 days in the desired pH [39].…”

Section: Fabrication Of Zno-nt/dmdeos and Zno-nt/pdmsmentioning

confidence: 99%

“…However, the WCA is slightly decreased at pH 10, and SA is increased from 3 o to 6 o , indicating the alkaline solution can corrode the superhydrophobic coating. This is mainly ascribed to the dissolution of ZnO at high alkaline pH [39]. .…”

Section: Surface Roughness Andmentioning

confidence: 99%

Improved Adhesion of Nonfluorinated ZnO Nanotriangle Superhydrophobic Layer on Glass Surface by Spray-Coating Method

Basiron

Sreekantan

Saharudin

et al. 2018

Journal of Nanomaterials

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In this present work, a superhydrophobic glass surface comprising zinc oxide nanotriangles (ZnO-nt) and nontoxic silylating agent was developed via a cost-effective spray-coating technology. ZnO-nt was synthesized by a hydrothermal method. Poly(dimethylsiloxane) (PDMS) and dimethyldiethoxysilane (DMDEOS) were used as nontoxic (nonfluoro) silylating agents. The morphology and crystallinity of ZnO-nt were studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. ZnO-nt with polymeric silane (PDMS) exhibited maximum wettability as compared to nonpolymeric silane (DMDEOS). The water contact angle (WCA), sliding angle (SA), and surface roughness of ZnO-nt/PDMS-coated glass substrate under UV treatment were 165 ± 1°, 3 ± 1°, and 791 nm, respectively. The WCA of ZnO-nt/PDMS was higher (165°) than that of commercial ZnO/PDMS (ZnO-C/PDMS). ZnO-nt/PDMS was strongly attached to the glass substrate with good stability and adhesion. The reasons for improved hydrophobicity, adhesion, and mechanism of hierarchical microstructure formation on the glass substrate were explained in detail. PDMS was attached to the glass substrate via hydrogen bonds from solvated zinc acetate.

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Robust superhydrophobic tungsten oxide coatings with photochromism and UV durability properties

Cited by 38 publications

References 38 publications

Spectroscopic Ellipsometry and Microstructure Characterization of Photochromic Oxygen‐Containing Yttrium Hydride Thin Films

Spectroscopic Ellipsometry and Microstructure Characterization of Photochromic Oxygen‐Containing Yttrium Hydride Thin Films

Superhydrophobic Surface with Gamma Irradiation Resistance and Self-Cleaning Effect in Air and Oil

Improved Adhesion of Nonfluorinated ZnO Nanotriangle Superhydrophobic Layer on Glass Surface by Spray-Coating Method

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